nehalem: Move mrc.cache to 0xfffe0000.

On nehalem there is no MRC.bin. To avoid excessively fragment the CBFS,
put MRC.bin as high as possible.

Change-Id: Ia3f7aef5a1e62a42c9fa9ea0f6eec2b29eb6722d
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4708
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/northbridge/intel/nehalem/Makefile.inc

@@ -37,7 +37,7 @@ $(obj)/mrc.cache:
 
 cbfs-files-y += mrc.cache
 mrc.cache-file := $(obj)/mrc.cache
-mrc.cache-position := 0xfff80000
+mrc.cache-position := 0xfffe0000
 mrc.cache-type := 0xac
 
 $(obj)/northbridge/intel/nehalem/acpi.ramstage.o : $(obj)/build.h